[Discover Tabs] Use openInNewTab in Background search flyout

[kertal]

Follow up of #234912

We extended discover locator to allow opening in a new tab in #234912. This was the first step. The next step would be to optimize the Discover <-> Tabs flyout interaction by making use of the openInNewTab functionality in the flyout.

@jughosta wrote in #234912

Additionally, this PR adds openInNewTab redux action. I think we should use it from Background Search flyout as it would append to tabs without the mentioned problems.

The flyout already has a callback allowing to provide custom callback that are triggered when a background search should be opened

https://github.com/jughosta/kibana/blob/6256d4de748f9269c1bd80fbe0de5b100fde2d35/src/platform/plugins/shared/data/public/search/session/sessions_mgmt/flyout/flyout.tsx#L48

so we would need to wire this up via UnifiedSearch connecting it to Discover state management

[elasticmachine]

Pinging @elastic/kibana-data-discovery (Team:DataDiscovery)

[jughosta]

More handling will be needed to restore the search session by its id:

kibana/src/platform/plugins/shared/discover/public/application/main/state_management/redux/actions/tabs.ts

Lines 369 to 374 in 27766ef

	if (searchSessionId) {
	newDefaultTab.dataRequestParams = {
	...newDefaultTab.dataRequestParams,
	searchSessionId,
	};
	}